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we had a chemistry teacher that was quite exited. One time the entire class met outside where a big pot of heated oil was standing on a fire. He added water to the oil and as the oil was mixed with the water vapor, the oxygen/fuel ratio made it combustable, nice 5m flames.
One of my professors, demonstrating so called skin effect, gave his body electrical voltage of 40,000 volts. He held in his hand fluorescent lamp, which shone. It did a great impression on the students.
This is why it's important that we reserve the privilege of teaching to people who are highly educated in the field they're to teach. In order to be an effective communicator, you must completely understand the material you're communicating, in order to take into account the many facets of the subject when analogising and relating, to make it both accurate and understandable. If we're going to entrust people to arm the next generation with the tools they need to survive and improve upon our work, we should at least make sure they know their shit, and how to teach it...
An Assault Rifle Yeah, but the person doing the teaching must know what they're talking about so that they can properly and concisely explain it, as well as answer tough questions the students will undoubtedly have.
i hope this was lower education or something, if these kids dont know this already at 14-15 age than pffftt!!! the teacher is very good he did this 1M times before i bet. he has a routine :)
As a physics major, his stress about giving the ball “0 speed” like his life was on the line was brilliant. His life wasn’t in danger, but now the students will remember that if he started it with velocity then it can return at a higher height. Brilliant trick my friend.
SirPerfectful wage-slavery is only meaningful for the top 1%, the billionaires. I suggest you research a far more productive way of life with a Resource Based Economy. You can find information about it if you search The Venus Project. Learn it.
nikhil chavan Potential energy is the amount of energy at a given height if it was to be released. The potential energy is given by the formula MGH or mass of the object times the gravity of acceleration times the given height. When the potential energy is released, it is then converted to kinetic energy because the energy is now in motion. The conservation of energy states that the potential energy initially will always be equally to the Kinetic energy. If you let an object fall 5 meters above, the potential energy will always equal to the kinetic energy when it is released in EXCEPTION to friction of air or other external factors. In this experiment however, the object is tied to a string, the string acts like a type of force known as tension that keeps the object from falling. This tension is also known as the centripetal force, which causes the objects to move in a circular motion as seen here as Potential energy converts to kinetic. When the object tied to the string is released from a given height, it transfer to kinetic energy and eventually reaches a point in the other end where it stops. The kinetic energy is now back to potential energy, and theoretically, this potential energy should equal to the initial potential energy when it was released. However, it’s not because air friction and gravity are some examples of external factors that slows down the speed and takes away the kinetic energy of the object. So as the object attempts travels back to its original point, it will always end up at a height lower than its original height,; thus, it will decrease in MGH.
Leafy's chin is non existent there for it will defy the laws of physics and create a massive black hole that will devour our entire universe and other ones until there is absolutely nothing but an empty void of despair previously known not just as our universe but existence as a whole and a big bang will happen again after 9 quintillion chromosome's but this time it will not create star's and galaxy's as we see today but instead a giant hologram of leafy saying " Holly shit its leafy" as he expands at the speed of 56 sextillion chromosome's per micro seconds filling up the entire dark void only to start a blackhole again and repeat the never ending life cycle of this miserable existence.
I am a teacher and at my school we cater to all types of learners. If you have a school full of teachers who don't consider that then it needs new administration. What I said is not ignorance, it's simple truth.
Some teachers/lecturers have a great gift to share - his students will remember what he has taught here forever. Such people can create a lifelong fascination in a subject.
As long as the piece of earth the professor is standing on doesn't drop six inches, he should be okay. As far as the pendulum goes, I believe nothing would change because you would have to convey the energy from the earthquake to the ball, and the cord is not able to convey that much energy because it is too small, and probably not dense enough either. Okay physics professors, tell me if I thought this out correctly!
it would be pulled in different directions loosing momentum along the X line. To calculate what exactly would happen you'd need to get into vector math .
its just to introduce a subject. you will have to relearn many things in college, because what you have been told in highschool is mostly simplified stuff which is of no use in engineering. e.g. in highscool you lear 3 binominal equasions. in engineering, these are infinate...
This was a fun experiment but everything he said is very simple shit that you learn at quite a low age in school (atleast in Finland). This was fun but they don't really learn anything because this can easilly be thought out by any student
I love seeing educators who can inform and amuse. I know can't always be this way, but it's wonderful when you're able to accomplish both. I'm sure the students will always remember this.
i had one like this in 7-9th grade, and surprisingly, I didnt really like him. Now im in 10th and got a extremely incompetent teacher, and I would do anything to get my old teacher back
I knew that the ball wouldn´t hurt him before, because physics. So I was very surprised, that the ball smashes the glas. I didn´t realize, that he gave the ball a little push.
In germany, you only get one picture and one mathematical equation describing what he said and you leave the lectrure to go home to understand all of this by yourself. I envy these students.
This may be true for some teachers or schools. I for myself had really got physics teachers at my school who were very enthusiastic and also did experiments like these (although not as extreme)
perhaps you accidently watched another intelligence-based video and the youtube recommendations setting boldly assumed you might enjoy another video not about gym-fails or screaming goats.
I can't believe this isn't something you teach children. Seriously, this is the base for which people would be able to figure out physics for themselves to avoid accidents. I've seen an 18 year old get up on a table with 1 support beam in the center, where he then walked out to the edge of the table, *and he was surprised that the table tipped over.*
i know right, I remember my 6th grade science teacher doing this exact lecture but actually in more depth lol. I also got to steer his car when it was in neutral (scary)
hes a former MIT professor and when he was there he did a big lecture and has a book aimed at the general public to promote physics. search walter lewin for the love of physics
my physics teacher actually did this with our class. he had volunteers come forth and sit on a chair and of course, all of us guys wanted to show whos ballsiest
Some people say "oh he's just reiterating it and making everyone up to speed". At university if you don't know this and are doing physics wtf are you doing. He could of just skipped straight to the experiment after showing 1 simple diagram how energy wouldn't be passed into the ball so it won't go any farther unless he adds speed.
+Jan Fetzer He had one of the best lectures at MIT... There are some of his lectures around, even though his "kinetic and (gravitational) potential energy" is the most famous one... (And I must admit it's fricking hilarious)
+Dragon Rager What's wrong with you? Lecturers do this because it is fun. It's fun for people who like physics. It's even WHY some people like physics. It's fun to watch. It's fun to do. It's theatrical. It gets people's attention, and it quickly sets the context. If you take the joy out of everything, what point is there in doing anything??? Go back to your law office!
This is like the bullet catch that has killed so many magicians. It's supposed to be perfectly safe, but all it takes is for somebody (a disgruntled former student, perhaps?) to substitute an over-unity ball for his normal one.
The ball doesn't even get to take a break, of course it doesn't come back the whole way. Maybe if the ball stopped for beer, watch the game with friends, see the mistress...
Now that's what teaching is about! professor Lewin bright, quick witted , intuitive, perceptive , he's got a compelling charm that has true erudition that inspires other's to learn
Seems like US and Canada many highschools offer physics only as elective, so many kids never have physics class in their life before college. I know, weird. I was surprised by this when I started my university in Canada. Additionally, 1st year physics is a quick run through highschool material - kinetics, dynamics, thermodynamics and magnetism.
That's very good. When I was teaching assistant for 1st year physics, it was very depressing to see all those kids that were completely bewildered and failing miserably (50% dropout or fail rate after 1st term) because they never had physics class before.
i watched an hour long video of his last day before retirement, it was this same exact lesson. I never went to college or took a shred of physics, yet I appreciate his work and passion greatly. if more than half of teachers were this passionate I would have a masters by now
I knew everything would go as he stated and that RU-vid wouldn't show a mans head being crushed. But...my heart rate still jumped when that ball started to swing back in his direction.
Immediately prior to the hover is heavy, and still aimed at his face. Any number of things could go wrong with the wire.The fastnings on the roof or the ball could come loose for example. Anyway, its unlikely, but still possible.
I had two great physic professors but he and she never did this with their pendulum lecture. What a great way to approach something that may seem abstract and put it into the real world meaning. Keep lecturing doc on.
I mean this is cool and all, but why are those kids just learning about that at this age? They should've learned this in fifth grade already. Also, why didn't he mention air resistance and other frictions at all? They are hugely important to this
air resistance and friction tend not to be taught at a university/highschool level for kinetics because the students should first learn to understand the fundamentals before learning about secondary effects; these will be introduced at a more advanced level or be used as more advanced problems for testing. Also I am unsure where you live that teaches this level of physics in grade 5 but in Canada this is a grade 11+ area of study, with the physics in lower grades being focused around electricity, and optics (science itself focus' on chemistry and biology for younger years, I assume since physics requires a greater knowledge of mathematics). In addition this lecture could very well be an introduction to physics for arts programs or any number of low level science elective for people who will not be using it for the rest of their education nor their career.
I think his point was that it couldn't exceed the height he dropped the ball from and any sort of resistive force would only take away from the mechanical energy of the ball.
